A new study released this morning by Millennial Branding reveals how and where Generation Y is working today, and may shed light on the future of work.

Data and analytics company Identified.com analyzed the Facebook profiles of four million Gen-Y users, aged 18 to 29, in November 2011. Of those reviewed, most (90%) lived in the U.S. and listed at least one college (80%).

However, just a third (36%) listed a job entry on their profiles, possibly because they view their education as a life-long identifier and their job as more temporary. “Gen-Y workers are job-hoppers,” says Dan Schawbel, founder of Millennial Branding, a Boston-based personal branding agency, and author of Me 2.0. “They spend an average of two years at their first jobs, and the average American will have nine jobs between the ages of 18 and 32.”

By 2025, Gen Y is expected to comprise 75% of the total workforce, yet currently just 7% work for America’s largest companies, according to the study. Interestingly, the biggest recruiter of Gen Y is the U.S. Armed Forces, which employs 3.2% in the Army, Navy, Marine Corps and Air Force. In fact, the breakdown of Gen Y’s top 10 employers looks like this: